import java.util.HashMap;

public class Demo02 {

    public static void main(String[] args){
        HashMap<String, String> map1 = new HashMap<>();
        HashMap<String, String> map2 = new HashMap<>(){};

        HashMap<String, String> map3 = new HashMap<>(){
            {
                put("1","1");
                put("2","2");
            }
        };
        System.out.println(map3.get("1"));
    }
}
